public class Test {
    public static void main(String[] args) {


        char a='Q';
        char b='闭';
        System.out.println(a);

    }
    public static void main3(String[] args) {



        double a=8.0;//也可以是8.0d，或8.0D。
        System.out.println(a);


        int a=10;
        short b=10;
        long c=10;
        byte d=10;

        System.out.println(Integer.MAX_VALUE);
        System.out.println(Short.MAX_VALUE);
        System.out.println(Long.MAX_VALUE);
        System.out.println(Byte.MAX_VALUE);
    }
    public static void main2(String[] args) {
        int a=8;
//        int b=8.0;
        double c=8.0;
//        float d=8.0;
        float e=8.0f;
    }
    public static void main1(String[] args) {
        System.out.println("hello world");
        System.out.println(18);
        System.out.println('A');
        System.out.println(18.8);
        System.out.println(true);
        System.out.println(20.1f);

    }



}
